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The crystal structure and stability of Ba 4 CaCu 3 O 8+δ have been investigated by neutron powder diffraction, differential thermal analysis and thermogravimetry. It is found that the phase is not stable below 1065K in p(O 2 )=1bar and decomposes according to the eutectoid reaction Ba 4 CaCu 3 O 8+δ +x O 2 ⇒Ba 2 CuO...
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